Answer
(a) 9 classes.
(b) Class 1:
lower class limit = 0
upper class limit = 0.9
Class 2:
lower class limit = 1.0
upper class limit = 1.9
Class 3:
lower class limit = 2.0
upper class limit = 2.9
Class 4:
lower class limit = 3.0
upper class limit = 3.9
Class 5:
lower class limit = 4.0
upper class limit = 4.9
Class 6:
lower class limit = 5.0
upper class limit = 5.9
Class 7:
lower class limit = 6.0
upper class limit = 6.9
Class 8:
lower class limit = 7.0
upper class limit = 7.9
Class 9:
lower class limit = 8.0
upper class limit = 8.9
(c) Class width = 1.0
Work Step by Step
(a) Just count the number of classes: 9
(b) For each class, the first number is the lower limit and the second number is the upper limit.
(c) It is the difference between two consecutive lower limits: $ 1.0-0=2.0-1.0=3.0-2.0=4.0-3.0=5.0-4.0=6.0-5.0=7.0-6.0=8.0-7.0=1.0$
